package com.common.excel;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

import org.apache.commons.collections4.CollectionUtils;
import org.apache.poi.ss.usermodel.Cell;

import com.alibaba.excel.enums.CellDataTypeEnum;
import com.alibaba.excel.metadata.Head;
import com.alibaba.excel.metadata.data.CellData;
import com.alibaba.excel.metadata.data.WriteCellData;
import com.alibaba.excel.write.metadata.holder.WriteSheetHolder;
import com.alibaba.excel.write.style.column.AbstractColumnWidthStyleStrategy;

public class EasyExcelCustomCellWriteHandler extends AbstractColumnWidthStyleStrategy {
	private Map<Integer, Map<Integer, Integer>> CACHE = new HashMap<>();

	@Override
	protected void setColumnWidth(WriteSheetHolder writeSheetHolder, List<WriteCellData<?>> cellDataList, Cell cell,
			Head head, Integer relativeRowIndex, Boolean isHead) {
		boolean needSetWidth = isHead || !CollectionUtils.isEmpty(cellDataList);
		if (needSetWidth) {
			Map<Integer, Integer> maxColumnWidthMap = CACHE.get(writeSheetHolder.getSheetNo());
			if (maxColumnWidthMap == null) {
				maxColumnWidthMap = new HashMap<>();
				CACHE.put(writeSheetHolder.getSheetNo(), maxColumnWidthMap);
			}

			Integer columnWidth = this.dataLength(cellDataList, cell, isHead);
			if (columnWidth >= 0) {
				if (columnWidth > 50) {
					columnWidth = 50;
				}
				Integer maxColumnWidth = maxColumnWidthMap.get(cell.getColumnIndex());
				if (maxColumnWidth == null || columnWidth > maxColumnWidth) {
					maxColumnWidthMap.put(cell.getColumnIndex(), columnWidth);
					writeSheetHolder.getSheet().setColumnWidth(cell.getColumnIndex(), columnWidth * 256);
				}
			}
		}
	}

	private Integer dataLength(List<WriteCellData<?>> cellDataList, Cell cell, Boolean isHead) {
		if (isHead) {
			return cell.getStringCellValue().getBytes().length;
		} else {
			CellData cellData = cellDataList.get(0);
			CellDataTypeEnum type = cellData.getType();
			if (type == null) {
				return -1;
			} else {
				switch (type) {
				case STRING:
					return cellData.getStringValue().getBytes().length;
				case BOOLEAN:
					return cellData.getBooleanValue().toString().getBytes().length;
				case NUMBER:
					return cellData.getNumberValue().toString().getBytes().length;
				default:
					return -1;
				}
			}
		}
	}
}
